Means for gauging saw blades



March 29, 1938. w, J BAUMANN 2,112,432

MEANS FOR GAUGING SAW BLADES FiledMay 13, 1937 IQIIIIIII INVENTOR.WILLIAM J. BAUMAN.

ATTORNEY.

Patented Mar. 29, 1938 UNITED STATES QFFMZE 8 Claims.

This invention relates to new and useful improvements in means forgauging and sharpen ing circular saw blades, such as set saws, hollowground saws, as well as groover saws, with raker teeth; and it has forits specific purpose to construct a device, whereby the raker or cleanerteeth may easily and quickly be filed down to an exact predeterminedheight or radius. This height or radius may be 3 2- or of an inchsmaller than the height or radius of the ordinary cutting teeth,according to the quality, condition and purpose of the lumber to be out.

As my device will be manufactured in different sizes, it will be made tofit saw blades of any diameter.

With the above and other objects in view, this invention consists of thenovel features of: construction, combination and arrangement of parts,hereinafter fully described, claimed and illustrated in the accompanyingdrawing forming part of this application, and in which similarcharacters indicate corresponding parts in all views, and in which:

Referring to said drawing:

Figure 1 is a side elevational view of my device in use, showing alsopart of a saw blade.

Figure 2 is a transverse sectional view of the same, taken on the line22 in Figure 1.

Figure 3 is an elevational view of a part of my device, the same beingviewed from the opposite side, as seen in Figure 1.

Figure 4 is a sectional view on the line 4--l in Figure 3; while theFigures 5 and 6 are detail side elevational 5 and bottom views,respectively, of the adjuster or setter.

Figure '7 shows one of the guiding cars in side elevation; and

Figure 8 is a transverse sectional View of the same, taken on the lineB8 in Figure '7.

Figure 9 is a top plan View of my device with parts of same removed, andthe adjuster in a different position from the one shown in Figure 1.

Figure 10 is a side elevational view, similar to Figure l, and showing amodification of my device; while Figure ll. is a detail transversesectional view of said modification, taken on the line H-H in Figure 10.

Figure 12 is a side elevational View; and Figure 13 a bottom view of thescrew bolt seen in Figure 11.

Referring more particularly to the drawing, i5

indicates part of an ordinary circular saw blade.

My device It, which is shown in adjusted position to fit said saw blade,consists primarily of a substantially fiat main body ll, to the centralportion of which is attached a somewhat U shaped member l8; twoadjustable members or 5 guides is, are mounted upon the side-pieces 23of the body ll, while an angularly shaped setter 20 is arranged on topof the U-shaped member and turnably secured to the latter by means of ascrew 2|. 10

The main body ll, which preferably is manuiactured, or made of aluminum,iron casting, or steel, and which may most conveniently be seen in theFigures 1 and consists of a central portion 22 and two side-pieces 23,which latter are 15 formed with oblong slots 24 therein.

It may in this connection be noted that the thickness of the upperportions of the side-pieces 23, and of the upper portion of the centralpart 22 is slightly reduced, as may especially be seen 20 in the Figures3 and 4;

The guides proper I9, each consists of a small, rectangular,substantially flat bar 25, which upon its upper side is provided with. asemi-cir cular projection 26 to which is integrally secured 25 a stud2i, this stud is made to freely slide in the slot 24, while the end 28of said stud is threaded to fit a wing nut 29.

The setter or adjuster 26 is pivotally mounted upon the U-shaped memberI8 by means of a 30 screw 2! and an actuating spring St. The action ofsaid spring may be regulated by the screw it, as the spring serves tohold the setter Zil firmly against the cut-out portion 33 in the memberit. The setter has four short legs 34 formed 5 by the cut-out portions3! and 32 therein; said cut-out portions having respectively the depthof and of an inch, as hereinbefore stated. The legs rest, when theadjustment of the device is made relative to a saw blade, upon the upper40 surface of the member Iii, or rather upon the bottom of the cut-outportion 33.

It will be noted that in order to arrest the setter proper in definitepositions, said setter has in its semi-circular end portion formed two45 grooves 35 and 36', as may be seen especially in the Figures 5 and 6said grooves are adapted to engage a small stud 3'! secured to aspringleaf 38, which latter in turn is attached to the member it bymeans of small screws 39. 50

When a saw blade is to be reset and sharpened, the usual method ofapplying a jointer stone is first resorted to in order to bring all thecutting teeth down to the same level.

In applying my device, the wing nuts 29 are 55 loosened enough to permitthe guides It to move freely up and down in the slots 24, so that theraker teeth 4E! may be made to rest against one of the cut-out portions35 or 32, as desired, and as seen in Figure 1. While in said position,the guides l8 are arranged to rest, each guide on two of the cuttingteeth, as indicated by M; the wing nuts are then next tightened, and thesetter 25B is turned sideways in order to permit the small top part ofthe raker tooth extending above the edge 33 to be filed off, accordingto the adjustment made.

To facilitate adjustment of the guides, one or more washers may, ifdesired, be arranged upon the stud 2? for cooperation with the wing nut29.

By placing, in turn, the device upon each raker tooth, maintaining theguides in the same position, and filing off the portion extending abovethe edge 33, all raker teeth will be filed down to exactly the samefraction of an inch, or smaller than the cutting teeth.

In View of the reduced thickness of the upper portions of theside-pieces 23 and the upper portion of the central part of the mainbody II, the outwardly bent teeth on a set saw, and the outer thickerportion of a hollow ground saw may move freely between the twoside-walls of the U-shaped member [3, and the upper part of the mainbody, to which latter one of said side-walls is integrally secured, asshown in Figure 1, without said teeth scraping against the metal. Therelative connection between said double walls of the U- shaped memberl8, which is open at the top, and the upper part of the main body I! mayconveniently be noted from Figure 9.

The U-shaped member i8 is made of case hardened steel, or similar hardmetal, so that filing of the raker teeth will not injure the surface ofthe same.

For the sake of convenience, a small mark 42 is made in the center ofthe ridge 33, in order to obtain a quick adjustment during operation.

The Figures 10 to 13 show slight modifications in the construction of mydevice.

Thus, in Figure 10 are shown guides 43, which in this modification areintegral with the side pieces indicated at 23 in Figure 1. Said combined guide and side pieces, as shown in Figure 10, will in addition tothe up and downward movement also lend themselves to a sidewaysadjustment. This sideways adjustment is accomplished by means ofhorizontal oblong slots 44 and square countersunk bolts 45, slidable inthe latter; thereby giving still more flexibility to the device.

A screw 46, a set screw 4'! and a rectangular bar 48, as shown in Figure10, replace in this modification the setter 2G in Figure 1. As the setscrew thus can be adjusted to any desired distance, one is not limitedto the two before mentioned fractions of an inch, ae and V64.respectively. A pin, 49 engaging a small slot 5i] in said bar, will holdthe latter in place during the adjustment.

It is obvious that some minor changes may be made in the construction,combination and arrangement of parts Within the scope of the appendedclaims, without departing from the spirit of the invention; and I donot, therefore, wish to limit myself to the exact construction shown anddescribed herein,

l/Vhat I claim as new, and desire to secure by Letters Patent of theUnited States, is:--

1. In a device of the class described, a base member having asubstantially fiat body portion, members arranged at the outer ends ofsaid base member and adapted to adjustably engage the teeth of a sawblade, a U-shaped member mounted upon said body portion, and a settercooperating with said U-shaped member.

2. In a device of the class described, a base member having asubstantially flat body portion, upwardly extending portions at each endof said base member and integral therewith, said upwardly extendingportions being formed with slots therein, adjustable guides movable insaid slots and adapted to engage the teeth of a saw blade, a U-shapedmember centrally disposed at the top of the base member, a settermounted upon said U-shaped member, and a screw-bolt securing said setterto the latter.

3. In a device of the class described, a base member, a U-shaped membercentrally mounted upon the latter, a setter cooperating with saidU-shaped member, a spring-actuated screw-bolt securing said setter tothe U-shaped member, said. setter being made with recesses in one endthereof, a leaf spring secured to the U-shaped memher, said leaf springhaving a stud thereon adapted to engage the recesses in the setter,upwardly extending projections at each end of the base member, andadjustable guides mounted upon the former.

4. In a device of the class described, a base member having asubstantially fiat body portion, upwardly extending projections at eachend thereof; said projections being formed with oblong slots therein,adjustable guides mounted in the latter and adapted to contact the teethof a saw blade, a U-shaped member centrally mounted upon the basemember, a setter made with two cut-out portions in its lower surface andadapted to cooperate with said U-shaped member, a spring actuatedscrew-bolt securing said setter to the U-shaped member, said setterbeing made with recesses in one end thereof, and a leaf spring securedto the U-shaped member, said leaf spring having a stud thereon adaptedto engage the recesses in the setter, whereby to fix the latter in apredetermined position.

5. In a device of the class described, a base member having asubstantially flat body portion and upwardly extending projections ateach end thereof, said body portion and projections being of adiminished thickness at their upper parts, the projections being formedwith slots therein, and adjustable guides mounted in said slots, aU-shaped member centrally arranged upon the base member, a setter madewith two cut-out portions of an unequal height in the lower surfacethereof, and adapted to cooperate with said U-shaped member, a springactuated screw-bolt securing the setter to the U-shaped member, saidsetter being made with recesses in one end thereof, and a leaf springsecured to the U-shaped member and adapted to engage the recesses in thesetter.

6. In a device, as claimed in claim 2, and wherein each of saidadjustable guides comprises a bar formed with a flat-faced lower surfaceand a projection upon the upper side thereof, a screwbolt integrallysecured to said projection and adapted to move in one of said slots, anda wing nut mounted upon the screw-bolt and adapted to secure the guidein an adjusted position with respect to the teeth of a saw blade.

'7. In a device of the class described, a substantially flat sided basemember, the end portions 01 the latter being formed with oblong slotstherein, guide members pivotally secured to said end portions, aU-shaped member disposed at the Cii top of said base member, a settermounted upon said U-shaped member, and means for adjusting the setter.

8. In a, device of the class described, a substantially flat sided basemember, the end portions of the latter being formed with oblong slotstherein, guide-members pivotally secured to said end portions, aU-shaped member disposed at the top of said base member, a. settercomprising a. bar turnably mounted upon the U-shaped memher, and anadjusting screw-bolt cooperating with said bar, and means for securingsaid bar in posi- 5 tion during operation.

WILLIAM J. BAUMANN.

